I'd like to plug my own favorite here: https://queup.net (former dubtrack.fm) let's you create your own playlists from YouTube and soundcloud, then you can make your own channel, people can join and you take turns playing what you put in your music queue.
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cvgm.net lets any listener queue up to 5-6 tracks. nectarine is 1-3 iirc, but I didn't hang out there much.
I'd like to plug my own favorite here: https://queup.net (former dubtrack.fm) let's you create your own playlists from YouTube and soundcloud, then you can make your own channel, people can join and you take turns playing what you put in your music queue.